地学前缘 ›› 2020, Vol. 27 ›› Issue (1): 48-54.DOI: 10.13745/j.esf.2020.1.6

• 地热资源评价与选区 • 上一篇    下一篇

苏北盆地干热岩地热资源前景分析

刘德民,张根袁,关俊朋,张硕,张婧琪,孔令昊,邵俊琦   

  1. 1. 中国地质大学(武汉) 地球科学学院, 湖北 武汉 430074
    2. 江苏省地质调查研究院, 江苏 南京 210018
    3. 中国地质大学(武汉) 地质调查研究院, 湖北 武汉 430074
  • 收稿日期:2019-03-20 修回日期:2019-10-20 出版日期:2020-01-20 发布日期:2020-01-20
  • 作者简介:刘德民(1975—),男,博士,副教授,长期从事区域地质矿产调查方面的教学和研究。E-mail:5guc@163.com
  • 基金资助:

    江苏省地质勘查专项资金项目“江苏省干热岩资源调查评价(苏财建[2018]96号)”“苏北盆地干热岩控热构造背景研究(2018016417)”“广西干热岩选区预测与分级评价(2019016110)”

Analysis of geothermal resources potential for hot dry rock in the Subei Basin

LIU Demin,ZHANG Genyuan,GUAN Junpeng,ZHANG Shuo,ZHANG Jingqi   

  • Received:2019-03-20 Revised:2019-10-20 Online:2020-01-20 Published:2020-01-20

摘要:

苏北盆地属于中、新生代“断陷型”盆地,发育前震旦系变质基底及古生代海相台地沉积,经历燕山期大规模岩浆火山构造活动,之后连续断陷沉降并沉积了厚度巨大的新生代地层;新生代苏北盆地处于持续活跃的洋陆构造带内,其特殊的构造位置使区内拥有相对高的大地热流值和较大的地温梯度,具有巨大的地热资源潜力。基于区域地热地质综合研究,本文针对苏北盆地地质构造特征、地温数据、地球物理信息等系统分析,初步证实了盆地内不仅存在浅部中低温地热资源,而且推断出盆地深部拥有温度较高的干热岩资源,其热源主要来源于深部的地幔,是本地区新生代区域伸展裂陷、地幔上涌、岩石圈减薄等作用的结果。根据干热岩选区的科学准则,盆地内优势前景区拥有丰富的动态热源、导热效果极佳的热通道、规模巨大的优势热储、良好保温作用的热盖层,并依据此初步建立成因模型,为进一步勘探与开发提供参考依据。

关键词: 苏北盆地, 干热岩, 潜力分析

Abstract:

The Subei Basin, a MesozoicCenozoic faultdepression,  developed on the preSinian System basement and Paleozoic marine platform deposits. From the Yanshanian Period, the area underwent large scale magmatic and volcanic tectonic activities and deposited ultra thick Cenozoic strata in the continuously active oceaniccontinental tectonic belt. This unique structural environment provides relatively high geothermal flow values and large geothermal gradient, therefore huge geothermal resource potential, in the Subei Basin. Based on the comprehensive investigation of regional geothermal geology, combined with synthesized analysis of geological structural characteristics, collected geothermal data and geophysical information, we preliminarily infer that there are not only shallow mediumlow temperature geothermal resources, but also high temperature hot dry rock(HDR) resources in the deep part of the region. We believe that the geothermal resources of HDR mainly come from the deep mantle and are the results of lithospheric thinning, mantle uplifting and the extensional cracking of crust since the Cenozoic. According to the scientific criteria of resources selection, the predominant prospecting area in the basin has abundant dynamic heat sources, excellent heat conduction channels, largescale thermal reservoirs and good thermal insulation cap rocks. Based on these analyses of HDR potential, we established a genetic model to provide reference for further exploration and development in the basin.

Key words: Subei Basin, hot dry rock, potential analysis

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